Test and/or measurement system and method for calibrating a test and/or measurement system

A method for calibrating a test and/or measurement system comprising:

• alternately connecting at least four different calibration standards to a device port of the test and/or measurement system;
• during the connection of each of the calibration standards:
• -generating an RF stimulus signal,
• forwarding the RF stimulus signal to the device port via a signal path of the test and/or measurement system,
• measuring the RF stimulus signal propagating to the device port via the signal path and a measurement signal received at the device port,
• generating measurement values representing the respective measurement results of the RF stimulus signal and of the measurement signal, and
• receiving the measurement values at a processing unit of the test and/or measurement system;
• wherein measuring comprises:
• forwarding at least a part of the RF stimulus signal from the signal path,
• forwarding at least a part of the measurement signal from the signal path,
• downconverting the forwarded part of the RF stimulus signal, and
• downconverting the forwarded part of the measurement signal;
• wherein a DC bias signal is coupled into the signal path during the connection of at least one of the calibration standards, but not during the connection of all of the calibration standards.

A test and/or measurement system comprising:

• an RF signal source configured to generate an RF stimulus signal;
• a device port;
• a signal path which is arranged to electrically connect the RF signal source to the device port;
• a measurement unit which is coupled to the signal path,
• wherein the measurement unit is adapted for measuring the RF stimulus signal propagating via the signal path to the device port and a measurement signal received at the device port,
• wherein the measurement unit is configured to generate measurement values representing the respective measurement results;
• a processing unit which is configured to receive the measurement values;
• and
• at least one bias tee which is coupled to the signal path,
• wherein the bias tee comprises a DC input port which is configured to receive a DC bias signal,
• wherein the bias tee is arranged to couple the received DC bias signal into the signal path;
• wherein the test and/or measurement system is operable in a calibration mode during which at least four different calibration standards are alternately connected to the device port;
• wherein, for each connected calibration standard, the measurement unit is configured to measure the RF stimulus signal and the measurement signal;
• wherein the test and/or measurement system is configured to couple the DC bias signal into the signal path via the bias tee during the connection of at least one of the calibration standards, but not during the connection of all of the calibration standards;
• and further comprising:
• at least a further device port;
• at least a further signal path which is arranged to electrically connect the RF signal source to the further device port;
• and
• at least a further measurement unit which is coupled to the further signal path, wherein the further measurement unit is adapted for measuring the RF stimulus signal propagating via the further signal path to the further device port and a further measure measurement signal received at the further device port.